Originally Posted by Ringfinger
I need to do this from home so I can see exactly what is going on.
I think I get it now, correct me if I am wrong:
1. For BD, generally it will be DTS or True HD. If I let the player decode, it will send a PCM stream to my receiver. That is a pure stream, like it was meant to be heard, no fancy changes. No better stream to get.
Yes, although it's dts-MA, not DTS. DTS is lossy compression, the same kind that is used on DVDs. dts-MA (Master Audio) is lossless compression, which produces what you call "a pure stream".
2. If I take that same BD and have the reciever process it, I can get the same result but it can tax the receiver possibly. All the lights come on the receiver, but basically I am outputting the same sound as in #1.
As I explained in your other thread,
, lossless decoding produces the same PCM no matter where it is done. Decoding in the player and the receiver produce the exact same output.
3. For regular DVD's with say a Dolby 5.1 track, what do I get as output in scenario #1? A 5.1 PCM stream?
DD 5.1 and DTS are both lossy compression schemes, meaning some of the data removed during compression is not restored during decompression. Some of the data is "lost" and the resulting PCM is not an exact match of the original PCM. But, it still doesn't matter where you decode. You lose the same data when decoding in the player or the receiver.
4. How does a 5.1 PCM stream to a receiver differ from a Dolby 5.1 stream to a receiver where then a receiver has to decode?
A 5.1 PCM stream is the source data. DD 5.1 compresses the source PCM by upwards of 10-to-1. When decoded, some of the original PCM is not restored.
They are the same, except the BD is doing all the work and they both will sound the same, correct?
So, no, they are not the same. A lossy output is never going to be the same as the original PCM.
However, with my receiver, I can then take that 5.1 and matrix it to 7.1 using Neo 6 or some processing that the receiver can do for me.
Your receiver can decode DD 5.1 and do matrix processing as well. You run into problems with decoding lossless dts-MA, which takes a lot more processing power than decoding lossy DD 5.1.
Bottom line, regardless of the receiver doing it or the BD player doing it, what sound comes out is the same (take away the secondary track mentioned)?
Yes, except for the limits I mentioned when it comes to processing the PCM after decoding dts-MA.
Now, I only have a 5.1 setup, so if the BD sends a 7.1 signal, what will the receiver do? Ha ha, a new twist.
It downmixes to 5.1. The receiver knows that you only have a 5.1 system because that's how you configured your AVR. So, it takes the audio for the rear channels and folds it into the surrounds and adjusts the surround volume so that it comes out sounding right.